Numerical Simulations of Ice Interaction with a Moored Structure

Sayed, Mohamed; Kubat, Ivana; Iyerusalimskiy, Aleksandr; Phadke, Amal C.; Hall, Brenda K.; Wright, B.

doi:10.5957/icetech-2012-129

Day 2 Tue, September 18, 2012 2012

DOI: 10.5957/icetech-2012-129

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Numerical Simulations of Ice Interaction with a Moored Structure

Mohamed Sayed

Ivana Kubat

Aleksandr Iyerusalimskiy

et al.

Abstract: Numerical simulations are carried out to represent the historical data of ice interaction with the Kulluk during the 1980s. Three dimensional simulations include dynamics of the ice cover and the response of the mooring system. The results give modes of ice accumulation, clearing and ice forces. Depth-averaged simulations consider larger zones of the ice cover to examine a range of conditions that were observed during the past operation of the Kulluk in the Beaufort Sea. The simulations evaluate the effects of… Show more

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Basis of Design and Specifications for Shallow Water Arctic MODU for Year-round Operation, Development and Exploration

et al. 2013

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In Arctic offshore areas where exploration and production of hydrocarbons may occur, a substantial portion lies in water depths less than 50 meters. Currently there are no MODU's which can drill all different well types, production and exploration, over a wide range of water depths from 10 m to 50 m, ice conditions, and facilitate alternative development plans, using wellhead platforms. ConocoPhillips Company, in cooperation with Keppel, Offshore and Marine and Technology Centre, have developed a basis of design and specifications for a Self elevating Arctic Mobile Offshore Drilling Unit (MODU) for use in these water depths capabilities to drill a wide range of wells. Economics require that a new build Arctic MODU be highly productive and operate nearly year-round. The Basis of Design and specifications result in a MODU that would have a wide range of application, be highly productive, and make alternative field development concepts viable. The focus of this paper is to detail major items that impact the size, weight, and configuration of an Arctic MODU. This will result in a conceptual unit design that will be used in determine ice loads, layout, and structural design of the Arctic MODU.

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Basis of Design and Specifications for Shallow Water Arctic MODU for Year-round Operation, Development and Exploration

et al. 2013

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Simulations of the Effect of the Rate of Change of Ice Direction on Stationkeeping of Drillships

et al. 2016

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This paper examines the response of a drillship to the action of an ice cover undergoing a gradual change of direction of motion. For effective stationkeeping, the drillship must continuously change its heading to face the oncoming ice. The simulations consider a vessel that maintains position using Thruster-Assisted Mooring (TAM). A turret mooring system resists the surge and sway movements, while the thrusters act to correct the heading. The simulations of ice deformation and drift solve equations that describe conservation of mass and momentum, and a failure criterion. The drillship is treated as a three-degrees-of-freedom (surge, sway and yaw) rigid body. The results give distributions of ice drift, deformation and stresses around the vessel as well as the forces and offsets of the drillship. The resulting peak ice forces and moments on the drillship show clear dependence on the rate of change of ice drift direction. As may be expected, ice forces and moments increase for high rates. They also increase for higher ice velocities. Analysis of the results shows that the ratio of the length of the drillship to the radius of curvature of ice drift trajectories can be used to estimate ice forces and moments in an environment of changing ice drift direction. The present work additionally included a cursory examination of the effects of ice cover conditions; namely ice thickness and the existence of ridge fragments and icebreaking tracks, which are often formed as part of ice management operations.

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Numerical Simulations of Ice Interaction with a Moored Structure

Cited by 2 publications

References 0 publications

Basis of Design and Specifications for Shallow Water Arctic MODU for Year-round Operation, Development and Exploration

Basis of Design and Specifications for Shallow Water Arctic MODU for Year-round Operation, Development and Exploration

Simulations of the Effect of the Rate of Change of Ice Direction on Stationkeeping of Drillships

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